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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bcaa4d156e4be63ca440eac0f7b1d8e7c06d9f30b36662f2b5e6a2d76d9b1d9f' 
  AND token = '1sb16erZUX3oFvhMhuyWwTLecPjselmBSIhqTnmWg/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}